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</pre><pre class='rust '>
<span class='comment'>// Copyright 2017 LambdaStack All rights reserved.</span>
<span class='comment'>//</span>
<span class='comment'>// Licensed under the Apache License, Version 2.0 (the &quot;License&quot;);</span>
<span class='comment'>// you may not use this file except in compliance with the License.</span>
<span class='comment'>// You may obtain a copy of the License at</span>
<span class='comment'>//</span>
<span class='comment'>// http://www.apache.org/licenses/LICENSE-2.0</span>
<span class='comment'>//</span>
<span class='comment'>// Unless required by applicable law or agreed to in writing, software</span>
<span class='comment'>// distributed under the License is distributed on an &quot;AS IS&quot; BASIS,</span>
<span class='comment'>// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.</span>
<span class='comment'>// See the License for the specific language governing permissions and</span>
<span class='comment'>// limitations under the License.</span>

<span class='attribute'>#<span class='op'>!</span>[<span class='ident'>allow</span>(<span class='ident'>unused_imports</span>)]</span>

<span class='kw'>extern</span> <span class='kw'>crate</span> <span class='ident'>ceph_rust</span>;
<span class='kw'>extern</span> <span class='kw'>crate</span> <span class='ident'>libc</span>;

<span class='kw'>use</span> <span class='ident'>libc</span>::<span class='op'>*</span>;
<span class='kw'>use</span> <span class='ident'>std</span>::<span class='ident'>ffi</span>::{<span class='ident'>CStr</span>, <span class='ident'>CString</span>};
<span class='kw'>use</span> <span class='ident'>std</span>::{<span class='ident'>ptr</span>, <span class='ident'>str</span>};

<span class='attribute'>#[<span class='ident'>cfg</span>(<span class='ident'>target_os</span> <span class='op'>=</span> <span class='string'>&quot;linux&quot;</span>)]</span>
<span class='kw'>use</span> <span class='ident'>ceph_rust</span>::<span class='ident'>ceph</span> <span class='kw'>as</span> <span class='ident'>ceph_helpers</span>;
<span class='attribute'>#[<span class='ident'>cfg</span>(<span class='ident'>target_os</span> <span class='op'>=</span> <span class='string'>&quot;linux&quot;</span>)]</span>
<span class='kw'>use</span> <span class='ident'>ceph_rust</span>::<span class='ident'>rados</span> <span class='kw'>as</span> <span class='ident'>ceph</span>;

<span class='macro'>macro_rules</span><span class='macro'>!</span> <span class='ident'>zeroed_c_char_buf</span> {
	(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>n</span>:<span class='ident'>expr</span>) <span class='op'>=&gt;</span> {
		<span class='ident'>repeat</span>(<span class='number'>0</span>).<span class='ident'>take</span>(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>n</span>).<span class='ident'>collect</span>::<span class='op'>&lt;</span><span class='ident'>Vec</span><span class='op'>&lt;</span><span class='ident'>c_char</span><span class='op'>&gt;&gt;</span>();
	}
}

<span class='attribute'>#[<span class='ident'>cfg</span>(<span class='ident'>not</span>(<span class='ident'>target_os</span> <span class='op'>=</span> <span class='string'>&quot;linux&quot;</span>))]</span>
<span class='kw'>fn</span> <span class='ident'>main</span>() {}

<span class='comment'>// NB: The examples below show a mix of raw native access and rust specific calls.</span>

<span class='attribute'>#[<span class='ident'>cfg</span>(<span class='ident'>target_os</span> <span class='op'>=</span> <span class='string'>&quot;linux&quot;</span>)]</span>
<span class='kw'>fn</span> <span class='ident'>main</span>() {
    <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>major</span>: <span class='ident'>i32</span> <span class='op'>=</span> <span class='number'>0</span>;
    <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>minor</span>: <span class='ident'>i32</span> <span class='op'>=</span> <span class='number'>0</span>;
    <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>extra</span>: <span class='ident'>i32</span> <span class='op'>=</span> <span class='number'>0</span>;

    <span class='kw'>let</span> <span class='ident'>config_file</span> <span class='op'>=</span> <span class='ident'>CString</span>::<span class='ident'>new</span>(<span class='string'>&quot;/etc/ceph/ceph.conf&quot;</span>).<span class='ident'>unwrap</span>();
    <span class='kw'>let</span> <span class='ident'>pool_name</span> <span class='op'>=</span> <span class='ident'>CString</span>::<span class='ident'>new</span>(<span class='string'>&quot;lsio&quot;</span>).<span class='ident'>unwrap</span>();
    <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>cluster</span>: <span class='ident'>ceph</span>::<span class='ident'>rados_t</span> <span class='op'>=</span> <span class='ident'>std</span>::<span class='ident'>ptr</span>::<span class='ident'>null_mut</span>();
    <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>ret_code</span>: <span class='ident'>i32</span>;

    <span class='comment'>// NB: These examples (except for a few) are low level examples that require the unsafe block.</span>
    <span class='comment'>// However, work for the higher level pur Rust is being worked on in the ceph.rs module of</span>
    <span class='comment'>// the library. A few of those are present below. We will create a common Result or Option</span>
    <span class='comment'>// return and allow for pattern matching.</span>

    <span class='kw'>unsafe</span> {
        <span class='ident'>ceph</span>::<span class='ident'>rados_version</span>(<span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='ident'>major</span>, <span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='ident'>minor</span>, <span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='ident'>extra</span>);
        <span class='ident'>ret_code</span> <span class='op'>=</span> <span class='ident'>ceph</span>::<span class='ident'>rados_create</span>(<span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='ident'>cluster</span>, <span class='ident'>std</span>::<span class='ident'>ptr</span>::<span class='ident'>null</span>());
        <span class='macro'>println</span><span class='macro'>!</span>(<span class='string'>&quot;Return code: {} - {:?}&quot;</span>, <span class='ident'>ret_code</span>, <span class='ident'>cluster</span>);

        <span class='ident'>ret_code</span> <span class='op'>=</span> <span class='ident'>ceph</span>::<span class='ident'>rados_conf_read_file</span>(<span class='ident'>cluster</span>, <span class='ident'>config_file</span>.<span class='ident'>as_ptr</span>());
        <span class='macro'>println</span><span class='macro'>!</span>(<span class='string'>&quot;Return code: {} - {:?}&quot;</span>, <span class='ident'>ret_code</span>, <span class='ident'>cluster</span>);

        <span class='ident'>ret_code</span> <span class='op'>=</span> <span class='ident'>ceph</span>::<span class='ident'>rados_connect</span>(<span class='ident'>cluster</span>);
        <span class='macro'>println</span><span class='macro'>!</span>(<span class='string'>&quot;Return code: {} - {:?}&quot;</span>, <span class='ident'>ret_code</span>, <span class='ident'>cluster</span>);

        <span class='ident'>ret_code</span> <span class='op'>=</span> <span class='ident'>ceph</span>::<span class='ident'>rados_pool_create</span>(<span class='ident'>cluster</span>, <span class='ident'>pool_name</span>.<span class='ident'>as_ptr</span>());
        <span class='macro'>println</span><span class='macro'>!</span>(<span class='string'>&quot;Return code: {}&quot;</span>, <span class='ident'>ret_code</span>);

        <span class='kw'>let</span> <span class='ident'>pools_list</span> <span class='op'>=</span> <span class='ident'>ceph_helpers</span>::<span class='ident'>rados_pools</span>(<span class='ident'>cluster</span>).<span class='ident'>unwrap</span>();
        <span class='macro'>println</span><span class='macro'>!</span>(<span class='string'>&quot;{:?}&quot;</span>, <span class='ident'>pools_list</span>);

        <span class='ident'>ret_code</span> <span class='op'>=</span> <span class='ident'>ceph</span>::<span class='ident'>rados_pool_delete</span>(<span class='ident'>cluster</span>, <span class='ident'>pool_name</span>.<span class='ident'>as_ptr</span>());
        <span class='macro'>println</span><span class='macro'>!</span>(<span class='string'>&quot;Return code: {}&quot;</span>, <span class='ident'>ret_code</span>);

        <span class='kw'>let</span> <span class='ident'>instance_id</span> <span class='op'>=</span> <span class='ident'>ceph</span>::<span class='ident'>rados_get_instance_id</span>(<span class='ident'>cluster</span>);
        <span class='macro'>println</span><span class='macro'>!</span>(<span class='string'>&quot;Instance ID: {}&quot;</span>, <span class='ident'>instance_id</span>);

        <span class='kw'>let</span> <span class='ident'>buf_size</span>: <span class='ident'>usize</span> <span class='op'>=</span> <span class='number'>37</span>; <span class='comment'>// 36 is the constant size +1 for null.</span>
        <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>fs_id</span>: <span class='ident'>Vec</span><span class='op'>&lt;</span><span class='ident'>u8</span><span class='op'>&gt;</span> <span class='op'>=</span> <span class='ident'>Vec</span>::<span class='ident'>with_capacity</span>(<span class='ident'>buf_size</span>);

        <span class='kw'>let</span> <span class='ident'>len</span> <span class='op'>=</span> <span class='ident'>ceph</span>::<span class='ident'>rados_cluster_fsid</span>(<span class='ident'>cluster</span>, <span class='ident'>fs_id</span>.<span class='ident'>as_mut_ptr</span>() <span class='kw'>as</span> <span class='op'>*</span><span class='kw-2'>mut</span> <span class='ident'>i8</span>, <span class='ident'>buf_size</span>);
        <span class='kw'>let</span> <span class='ident'>slice</span> <span class='op'>=</span> <span class='ident'>slice</span>::<span class='ident'>from_raw_parts</span>(<span class='ident'>fs_id</span>.<span class='ident'>as_mut_ptr</span>(), <span class='ident'>buf_size</span> <span class='op'>-</span> <span class='number'>1</span>);
        <span class='kw'>let</span> <span class='ident'>s</span>: <span class='kw-2'>&amp;</span><span class='ident'>str</span> <span class='op'>=</span> <span class='ident'>str</span>::<span class='ident'>from_utf8</span>(<span class='ident'>slice</span>).<span class='ident'>unwrap</span>();
        <span class='macro'>println</span><span class='macro'>!</span>(<span class='string'>&quot;rados_cluster_fsid len: {} - {}&quot;</span>, <span class='ident'>len</span>, <span class='ident'>s</span>);

        <span class='comment'>// Rust specific example...</span>
        <span class='kw'>let</span> <span class='ident'>cluster_stat</span> <span class='op'>=</span> <span class='ident'>ceph_helpers</span>::<span class='ident'>rados_stat_cluster</span>(<span class='ident'>cluster</span>);
        <span class='macro'>println</span><span class='macro'>!</span>(<span class='string'>&quot;Cluster stat: {:?}&quot;</span>, <span class='ident'>cluster_stat</span>);

        <span class='comment'>// Mon command to check the health. Same as `ceph -s`</span>
        <span class='kw'>match</span> <span class='ident'>ceph_helpers</span>::<span class='ident'>ceph_mon_command</span>(<span class='ident'>cluster</span>, <span class='string'>&quot;{\&quot;prefix\&quot;: \&quot;status\&quot;}&quot;</span>) {
            <span class='prelude-val'>Ok</span>((<span class='ident'>outbuf</span>, <span class='ident'>outs</span>)) <span class='op'>=&gt;</span> {
                <span class='kw'>match</span> <span class='ident'>outbuf</span> {
                    <span class='prelude-val'>Some</span>(<span class='ident'>output</span>) <span class='op'>=&gt;</span> <span class='macro'>println</span><span class='macro'>!</span>(<span class='string'>&quot;Ceph mon command (outbuf):\n{}&quot;</span>, <span class='ident'>output</span>),
                    <span class='prelude-val'>None</span> <span class='op'>=&gt;</span> {},
                }
                <span class='kw'>match</span> <span class='ident'>outs</span> {
                    <span class='prelude-val'>Some</span>(<span class='ident'>output</span>) <span class='op'>=&gt;</span> <span class='macro'>println</span><span class='macro'>!</span>(<span class='string'>&quot;Ceph mon command (outs):\n{}&quot;</span>, <span class='ident'>output</span>),
                    <span class='prelude-val'>None</span> <span class='op'>=&gt;</span> {},
                }
            },
            <span class='prelude-val'>Err</span>(<span class='ident'>e</span>) <span class='op'>=&gt;</span> {<span class='macro'>println</span><span class='macro'>!</span>(<span class='string'>&quot;{:?}&quot;</span>, <span class='ident'>e</span>);},
        }

        <span class='comment'>// Currently - parses the `ceph --version` call. The admin socket commands `version` and `git_version`</span>
        <span class='comment'>// will be called soon to replace the string parse.</span>
        <span class='kw'>let</span> <span class='ident'>ceph_ver</span> <span class='op'>=</span> <span class='ident'>ceph_helpers</span>::<span class='ident'>ceph_version</span>();
        <span class='macro'>println</span><span class='macro'>!</span>(<span class='string'>&quot;Ceph Version - {:?}&quot;</span>, <span class='ident'>ceph_ver</span>);

        <span class='ident'>ceph</span>::<span class='ident'>rados_shutdown</span>(<span class='ident'>cluster</span>);
    }

    <span class='macro'>println</span><span class='macro'>!</span>(<span class='string'>&quot;RADOS Version - v{}.{}.{}&quot;</span>, <span class='ident'>major</span>, <span class='ident'>minor</span>, <span class='ident'>extra</span>);

}
</pre>
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